I have following Table / Array:

If I press the blue button, then all items with the same group as the record should change the Status (Gratis). But now it just change the Value of the Record and all items above it. As an example, if I press the Button on Record No. 1 then itselft and all above (No. 0) get an change of the Status (Gratis).

Following code im using to go through the array and change the Status:

private _updateFreeStatus = (record: QuestionModel): void => {
        fetch('api/Test/UpdateGratisStatus', {
            headers: { 'Content-Type': 'application/json' },
            method: 'PUT',
            body: JSON.stringify({
                'group': record.group,
                'free': record.free,
            })
        });
        this.state.question.map(item => {
            if (item.group === record.group)
            {
                item.free = !record.free;
            }
        });
    }

CodePudding user response：

1. do not mutate the state
2. create a copy, and use setState

Use

const updatedQuestions = this.state.question.map(item => {
  if (item.group === record.group) {
    return {
       ...item,
       free: !record.free
    }
  }
  return item;
});

this.setState({question: updatedQuestions});